An assembly is provided that includes first and second end plates adapted to be coaxially aligned when in use. One or more members extend from the end plates or an annular ring, the annular ring provided between the end plates, the other of the end plates or annular ring comprising one or more first slots at one end thereof to be aligned with and for receiving the one or more members of the first end plate, and one or more second slots at the other end thereof to be aligned with and for receiving the one or more members. Resilient sealing members are provided around the one or more members between the end plates and annular ring, and an urging mechanism urges the first and second end plates towards the annular ring to deform the first and second resilient sealing members to engage the inner wall of the pipe.

A pipe facing machine (PFM) system includes a PFM and a hydraulic power source having a single hydraulic pump arranged to provide a hydraulic oil flow to the PFM via single hydraulic circuit. The PFM includes a body defining an axis and a cutting head arranged to rotate and translate relative to the axis. Drive systems are arranged to drive clamping of the PFM on a workpiece, rotation of the cutting head about the axis, and translation of the cutting head along the axis. A hydraulic controller includes a plurality of control elements and hydraulically connects the drive systems. The hydraulic controller is arranged to direct and regulate hydraulic oil flow between the drive systems and the hydraulic controller based on signals from the control elements and a computer control system.

A pair of separators is overlapped and placed on a base jig and thereby positioned with each other. Respective through-holes thereof are positioned to the position of a pin hole provided in the base jig. When a main jig is pressed against the base jig to clamp the pair of separators, and a pin of a sub-jig is inserted into the pin hole to clamp the pair of separators by a head, an annular light guiding path is formed by a gap generated between an opening provided in the main jig and the head of the sub-jig, and hence a laser welding position which surrounds the through-holes is exposed. The surrounding of each through-hole is seamlessly laser-welded when the laser welding position is irradiated with a laser beam.

The assembly and welding mill for production of pipes includes a tubular billet feed device with a roller table having a longitudinal axis and passing through the assembly and welding stand with radial hold-down roller beams intended for reduction of a tubular billet that travels along the roller table and a longitudinally oriented guide knife, a carriage with rollers enabling rotation of the rollers on the inner surface of the tubular billet being moved through the assembly and welding stand. On the supporting elements of assembly and welding stand there is a laser welding head or a laser-arc hybrid welding head that can travel in transverse and vertical directions and around longitudinal axis. The carriage is rigidly connected with the supporting elements of the assembly and welding stand through a vertically oriented and longitudinally directed connecting knife. The guide knife is intended for tubular billet positioning through opening of edges at 12 o'clock position and is mounted on the supporting elements of the assembly and welding stand configured to enable vertical travel and fixation. On the carriage, there is a hold-down roller facing upwards that can travel in vertical direction to act on the edges of tubular billet from the inner side, while one of the roller beams is installed vertically that can act on the tubular billet edges from the outer side. Technical result: application of a root weld with laser technologies with guaranteed alignment of tubular billet edges regardless of size.

The invention relates to a pipeline internal centering device for centering a first pipe (28) relative to a second pipe (30), having a centering unit (12) for aligning the second pipe (30) relative to the first pipe (28), and having a transport device (14) for moving along a longitudinal axis (L) of the pipeline internal centering device (10). According to the invention, a rotary device (48) is provided by means of which the pipeline internal centering device (10) can be rotated about its longitudinal axis (L).

An alignment device for aligning a tube panel with a plurality of pipes system and a method of performing the alignment is provided. The alignment device is used in a panel comprising a plurality of tubes having an inner diameter and an outer diameter. The alignment device includes a cylindrical first portion sized to fit within the tube inner diameter. A tapered second portion is provided opposite the cylindrical first portion, the tapered second end having a first end diameter that is substantially the same size as the outer diameter.

A backing plate for includes a synthetic diamond portion configured to abut a joint region during a welding operation. A welding clamp includes a plurality of clamping blocks, each including a synthetic diamond portion configured to abut a pipe joint region during a welding operation. Because the backing plate and clamping block each include a synthetic diamond portion, the backing plate and clamping block can withstand high welding temperatures without damaging or diminishing the quality of the weld.

A backing plate for includes a synthetic diamond portion configured to abut a joint region during a welding operation. A welding clamp includes a plurality of clamping blocks, each including a synthetic diamond portion configured to abut a pipe joint region during a welding operation. Because the backing plate and clamping block each include a synthetic diamond portion, the backing plate and clamping block can withstand high welding temperatures without damaging or diminishing the quality of the weld.

A backing plate for includes a synthetic diamond portion configured to abut a joint region during a welding operation. A welding clamp includes a plurality of clamping blocks, each including a synthetic diamond portion configured to abut a pipe joint region during a welding operation. Because the backing plate and clamping block each include a synthetic diamond portion, the backing plate and clamping block can withstand high welding temperatures without damaging or diminishing the quality of the weld.

A device for welding pipe branches and extensions to a main pipe from inside the main pipe. The device includes a frame (30) and a frame cylinder (31), an elongated electrode shaft (3) having a longitudinal central axis, around which the electrode shaft is rotatably arranged, a rotator disc (13) of the electrode shaft (3), through which the electrode shaft is able to slide axially, an electrode holder (4) in the end of the electrode shaft, an electrode (5) fastened to the holder (4), a welding jig (1, 1.2, 1.3; 2.3, 2.4, 2.5) for supporting the main pipe (6.1; 2.2a) in the welding station, a fastening element (8, 8a) of the welding jig, a rotating element (9) of the welding jig, to which the fastening element is fastened and which is rotatably bearing-mounted inside the frame cylinder (31) such that the rotational axis of the welding jig combines with the central axis of the electrode shaft. The welding jig has a support bracket (1.2, 1.3; 2.4, 2.5) for the main pipe (6.1; 2.2a), by which the main pipe is to be supported in the station, in which the centre axes of the main pipe (6.1; 2.2a) and the electrode shaft (3) are combined. The welding jig has, surrounding the electrode shaft (3), an adapter piece (23), to which is connected a shielding gas channel (24), the shielding gas being adapted to be guided through the adapter piece (23), into the main pipe, and through it, also into the pipe branch or extension to be welded, when the main pipe, or the pipe extension (6.3) to be welded to the main pipe, or the shielding gas pipe (2.3) surrounding the main pipe rests against the adapter piece (23). The rotator disc (13) of the electrode shaft is equipped with a locking device (12), with which the electrode shaft (3) is to be immovably locked in relation to the rotator disc (13).